Possible Clues:

• Sammy Davis Jr.'s 'I've Gotta ___'
• Everly Brothers' 'Let It --'
• Everly Brothers' "Let It —"
• 'Let It --' (1960 hit song)
• "Let it ___" (Everly Brothers classic)
• The Everly Brothers 'Let It --''
• 'It's Not Easy to ___'
• ''Let It ___'' (Everly Brothers hit)
• "I've Gotta __"
• 'It's Gonna --' ('N Sync song)